<template>
  <div v-show="showFlag" class="food" transition="move" v-el:food>   <!--动画第一步 transition="move" 滚动第二步 添加v-el:food-->
    <div class="food-content">
      <div class="image-header">
        <img :src="food.image">
        <div class="back" @click="hide">
          <i class="icon-arrow_lift"></i>
        </div>
      </div>
      <div class="content">
        <h1 class="title">{{food.name}}</h1>
        <div class="detail">
          <span class="sell-count">月售{{food.sellCount}}份</span>
          <span class="rating">好评率{{food.rating}}%</span>
        </div>

        <div class="price">
          <span class="now">￥{{food.price}}</span><span class="old"
                                                        v-show="food.oldPrice">￥{{food.oldPrice}} </span>
        </div>
        <div class="cartcontrol-wrapper">
          <cartcontrol :food="food"></cartcontrol>
        </div>
        <div @click.stop.prevent="addFirst($event)" class="buy" v-show="!food.count || food.count===0"
             transition="fade">
          加入购物车
        </div>
      </div>

      <split v-show="food.info"></split>

      <div class="info" v-show="food.info">
        <h1 class="title">
          商品信息
        </h1>
        <p class="text">{{food.info}}</p>
      </div>

      <split></split>
      <div class="rating">
        <h1 class="title">商品评价</h1>
        <ratingselect :select-type="selectType" :only-content="onlyContent" :desc="desc" :ratings="food.ratings"></ratingselect>
      </div>
    </div>

  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from "better-scroll";   //滚动第一步  引入
  import Vue from 'vue';
  import cartcontrol from 'components/cartcontrol/cartcontrol';
  import split from 'components/split/split';
  import ratingselect from 'components/ratingselect/ratingselect';

  const POSITIVE = 0;
  const NEGATIVE = 1;
  const ALL = 2;

  export default {
    props: {
      food: {
        type: Object
      }
    },
    data(){
      return {
        showFlag: false,
        //控制评论组件的数据
        selectType: ALL,
        onlyContent: true,
        desc: {
          all: '全部',
          positive: '推荐',
          negative: '吐槽'
        }
      };
    },
    methods: {
      addFirst(event){
        if (!event._constructed) {
          return;
        }
        Vue.set(this.food, 'count', 1);
        //派发一个小球的事件
        this.$dispatch('cart.add', event.target);  //这里防止加入购物车变为none就找不到位置了   将加入购物车加入动画就不会立刻消失
      },
      show(){   //私有方法设为_开头
        this.showFlag = true;

        //初始化评论组件
        this.selectType = ALL;
        this.onlyContent = true;


        //滚动第三部  使用$nextTick确保dom是被渲染的
        this.$nextTick(() => {
          if (!this.scroll) {   //给v-el:food添加滚动组件
            this.scroll = new BScroll(this.$els.food, {
              click: true
            });
          } else {
            this.scroll.refresh();
          }
        });

      },
      hide(){
        this.showFlag = false;
      }
    },
    components: {
      cartcontrol,
      split,
      ratingselect
    }
  };
</script>

<style lang="stylus" rel="stylesheet/stylus">
  //相对于屏幕定位 覆盖整个屏幕
  .food
    position: fixed
    left: 0
    top: 0
    bottom: 48px //底部购物车
    z-index: 30
    width: 100%
    background: #ffffff
    &.move-transition //第二步  写动画
      transition: all 0.2s linear //动画速度   线性的方式
      transform: translate3d(0, 0, 0)
    &.move-enter, &.move-leave
      transform: translate3d(100%, 0, 0)
    .image-header
      position: relative
      width: 100%
      height: 0
      padding-top: 100%
      img
        position absolute
        top: 0
        left: 0
        width: 100%
        height: 100%
      .back
        position: absolute
        top: 10px
        left: 0
        .icon-arrow_lift
          display: block
          padding: 18px //放大点击区域
          font-size: 20px
          color: #ffffff

    .content
      position: relative
      padding: 18px
      .title
        line-height: 14px
        margin-bottom: 8px
        font-size: 14px
        font-weight: 700
        color: rgb(7, 17, 27)
      .detail
        margin-bottom 18px
        line-height: 10px
        height 10px
        font-size 0
        .sell-count, .rating
          font-size: 10px
          color: rgb(147, 153, 159)
        .sell-count
          margin-right: 12px
      .price
        font-weight 700
        line-height: 24px
        .now
          margin-right: 8px
          font-size: 14px
          color: rgb(240, 20, 20)
        .old
          text-decoration line-through //删除线
          font-size: 10px
          color: rgb(147, 153, 159)
      .cartcontrol-wrapper
        position: absolute
        right: 12px
        bottom: 12px
      .buy
        position: absolute
        right: 18px
        bottom: 18px
        z-index: 10 //盖住选择组件
        height: 24px
        line-height: 24px
        padding: 0 12px
        box-sizing border-box
        font-size: 10px
        border-radius: 12px
        color: #ffffff
        background: rgb(0, 160, 220)
        &.fade-transition
          transition all 0.2s
          opacity 1
        &.fade-enter, &.fade-leave
          opacity: 0
    .info
      padding: 18px
      .title
        line-height: 14px
        margin-bottom: 6px
        font-size: 14px
        color: rgb(7, 17, 27)
      .text
        line-height: 14px
        padding: 0 8px
        font-size: 12px
        color: rgb(77, 85, 93)
    .rating
      padding-top: 18px
      .title
        line-height: 14px
        margin-left: 18px
        font-size: 14px
        color: rgb(7, 17, 27)
</style>
